call_action and Umlauts in arguments - utf-8 documentation

I am not sure if this problem is because of myself, I even debugged your code, but still I am lost what is the problem. In short the problem: although it seems everything to be utf-8, even the name ‘CallBlockerTest-Ümlaut’ itself, it will not work because and only because of the ü (if I remove it, all works fine). I post the stacktrace below. I also searched in the official documentation but did find nothing about how to handle Umlaute/Umlauts correctly… fc is fritzconnection in my case…

        arg = {'NewPhonebookID': pb_id,
               'NewPhonebookEntryID': '',
               'NewPhonebookEntryData':
                   f'<?xml version="1.0" encoding="utf-8"?>'
                   f'<Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">'
                   f'<contact>'
                   f'<category>0</category>'
                   f'<person><realName>{name}</realName></person>'
                   f'<telephony nid="1"><number type="home" prio="1" id="0">{number}</number></telephony>'
                   f'</contact>'
                   f'</Envelope>'}

        return self.fc.call_action('X_AVM-DE_OnTel:1', 'SetPhonebookEntry', arguments=arg)

Traceback (most recent call last):
  File "C:/workspace/python/a1-fritzbox/a1fritzbox/phonebook.py", line 146, in <module>
    result = pb.add_contact(2, 'CallBlockerTest-Ümlaut', '009912345', skip_existing=False)
  File "C:/workspace/python/a1-fritzbox/a1fritzbox/phonebook.py", line 81, in add_contact
    return self.fc.call_action('X_AVM-DE_OnTel:1', 'SetPhonebookEntry', arguments=arg)
  File "C:\Python3\lib\site-packages\fritzconnection\core\fritzconnection.py", line 215, in call_action
    return self.soaper.execute(service, action_name, arguments)
  File "C:\Python3\lib\site-packages\fritzconnection\core\soaper.py", line 194, in execute
    return handle_response(response)
  File "C:\Python3\lib\site-packages\fritzconnection\core\soaper.py", line 176, in handle_response
    raise_fritzconnection_error(response)
  File "C:\Python3\lib\site-packages\fritzconnection\core\soaper.py", line 105, in raise_fritzconnection_error
    raise exception(message)
fritzconnection.core.exceptions.FritzConnectionException: UPnPError: 
errorCode: 502
errorDescription: XML error

BTW, if I use ü instead of ü it will work and arrive as ü in the phonebook. But TBH I don’t want to create html entities, or do I have to? Although everything is set to utf-8, even the content-type header? Is it something AVM Fritzbox specific?

[kbr]

Fixed with 1.3.3 So I like to close this.

[bufemc]

Just if anyone would pass by later, again:

After doing pip install fritzconnection --upgrade

the situation is this now:

I can add something with Umlaut now, without any 502 error etc, but it arrived first in the phonebook as:

CallBlockerTest-Umläut

So I re-checked my envelope, and it is mandatory to have

                   f'<?xml version="1.0" encoding="utf-8"?>'
                   f'<Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">'

in the beginning, so the “Umläut” arrives now correctly.

Thank you a lot! Best Fritz lib ever ,)